Birch manufacturing is considering the addition of another product line to its offerings. Equipment needed to produce the new line will cost $181,060. Birch estimates that the net cash inflows from the new product line will be as follows: Years 1-10 Years 11-15 Year 16-20 $17,100 (each year) $5,030 (each year) $2,140 What is the payback period for the new product line? years Payback period